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  1. mathematics
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  3. determine whether the study depicts an observation

Determine whether the study depicts an observational study or an experiment Sixty patients with vision...

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Determine whether the study depicts an observational study or an experiment Sixty patients with vision loss are divided into two groups One group is treated with experimental surgery The other is not After one month both groups are questioned about their ability to read Is the study an observational study or an experiment OA The study is an experiment because the study examines individuals in a sample but does not try to influence the variable of interest OB The study is an experiment because the researchers control one variable to determine the effect on the response variable OC The study is an observational study because the study examines individuals in a sample but does not try to influence the response variable OD The study is an observational study because the researchers control one variable to determine the effect on the response variable

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